so pro' photographers are all lining up to get their Tamron zoomsI dont think so ...

Some do some don't. Lens works with the system, and whichever system delivers better results wins. This is the main message in this sub-thread (whichever way it started). I used Tamron only on a few occasions, back in the D200 days, and in each case the results were quite acceptable. But then again, I am hiding my face in shame, what more can I say.